Data/hora: 09/06/2024 10:38:58

Provedor de dados: | Bragantia
País: | Brazil
Título: | Genetic diversity, population structure and AFLP markers associated with maize reaction to southern rust
Autores: | Giordani,Willian; Scapim,Carlos Alberto; Ruas,Paulo Maurício; Ruas,Claudete de Fátima; Contreras-Soto,Rodrigo; Coan,Marlon; Fonseca,Inês Cristina de Batista; Gonçalves,Leandro Simões Azeredo.
Data: | 2019-06-01
Ano: | 2019
Palavras-chave: | Zea mays; Gwas; Association studies; Cluster analysis; Genetic distance; Puccinia polysora.
Resumo: | ABSTRACT Maize is one of the species with greater genetic diversity among cereals and possibly the most diverse crop species known. Accessing this variability is essential for maize breeding, allowing breeders to achieve progress of yield increasing, overcome environmental challenges or deal with pests and diseases. Among the maize diseases, southern rust is one of the most important, causing significant losses in yield and presenting severe epidemics worldwide. In the present study, the AFLP technique was applied to analyze population structure and genetic diversity among 145 tropical maize inbred lines, and to test for preliminary evidence of association between AFLP markers and the reaction to southern rust. Disease severity was evaluated in two crop seasons and the accessions were genotyped through AFLP using four primer combinations. The clusters obtained based on the Jaccard genetic distance and Ward’s hierarchical clustering and those achieved by structure simulations had high concordance and were capable of establish two big clusters, one predominantly of common maize and another of popcorn. The association analysis was performed using four different statistical models. The more complete model containing both population structure and genetic relatedness narrowed the number of significant associations, demonstrating its importance to control false associations. A total of 19 significant marker associations were identified from which three (EactMctg18, EactMctg205, EactMctg169) are interesting candidates for further investigations.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000200183
Editor: | Instituto Agronômico de Campinas
Relação: | 10.1590/1678-4499.20180180
Formato: | text/html
Fonte: | Bragantia  v.78 n.2 2019
Fonte: | info:eu-repo/semantics/openAccess